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Originally Posted by MyFairLacy  Females have two X sex chromosomes, and Males have one X and one Y sex chromosome. So females are XX and Males are XY. The eggs a female produces will always have one X chromosome (since females are XX they can only give an X chromosome). But a males sperm can either carry the X chromosome or the Y chromosome. So when a sperm unites with an egg, depending on whether the sperm is X or Y, the offspring will become XX (female) or XY (male). Sex is always determined by the male's sperm as females only contribute an X chromosome. |
My Fair Lacy . . .excellent explanation and thanks to the others for their reply.